method 1 :THE DOODLE
here sign in to yahooo
double click on the person who u want check on…..
ths opens a window of insatant messeging
click on IMvironment then Interactive fun>doodle
wait for it to load after loading is complete you will see ” wait for ur buddy to load doodle”
BUZZ him or sent any messege….. if the page slides…… BUSTED the person is online
if it satys like ” wait for ur buddy to load doodle” u spied on an innocent personn……..
method II
Download a software called “BUDDY SPY” sign in that with ur username and u can chechk on any id that not ven on your list …..
i wont reccomend this because u have to sign in with ur account on a third party sofware
u can downlaod the software here http://www.buddy-spy.com/